Perpetual calendar



H; 0. WINDAHL.

PERPETUAL CALENDAR. APPLICATION FILED NOV. 24 1920- v 1,401,385, I Patented Dec. 27, 1921.

UNITED STATES PATENT OFFICE.

rnnrnzrunn CALENDAR.

Specification of Letters Patent.

Patented Beam, 1921.

Application filed November 24, 1920. Serial No. 426,288.

To all whom it my camera:

Be it known that I, HAROLD 0. VVINDAHL, a citizen of the United States, and a resident of the city of Chicago, county of Cook. and State of lllinois, have invented certain new and useful Improvements in Perpetual Calendars, of which the following is a specification.

My invention relates to a perpetual calendar, and has for its object the provision of a calendar which is sim le in construction, inexpensive in menu acture, easy to understand and arrange, which may be reset for perpetual use and is adapted to take the place of the ordinary desk or wall calendar.

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed,

And will be best understood by reference to the accompanying drawings forming a part of this specification, and in which,

Figure 1 is a front or face view of the calendar showing parts of the facing memher broken away;

Fig. 2 is an edge view thereof; and,

. Fig. 3 is a fragmentary rear view of the calendar.

The invention illustrated in the drawings shows a holder supported in a frame 6 and comprising a facing member 7 having a slot 8 and an opening 9 therein, with a strip 10 between said slot and opening. The strip .10 contains separate spaces with the days of the week indicated in proper sequence in said spaces. The holder further comprises a back member 11 having slots 12 and a vertical slot 12 and a lateral slot 13 therein, through which extend and are operable, the knobs 14 and 15. The knob 14 is connected to the rear of a plate or sheet 16 which contains on its face, in proper sequence, the 12 months of the year with the number of days in each month and number of the months in the year; one month being visible at a time through the slot 8. The knob 15 is connected to the rear of a sheet or plate 17 which contains vertical columns of numbars on its face, the successive number in each column increasing by seven, as 1, 8,

15, 22, 29; and the numbers in the various columns are arranged in lateral alinement and consecutively, as 1,2, 3, etc.

Located near the back plate 11 are guide strips 18 for the month plate 16, one on each side thereof, and near the facing plate 7 1s a support and guide member 19 for the date plate 17, upon which said plate has a lateral sliding movement.

In operation the month plate 16 is moved vertically by means of the knob 14 until the proper month with the number of days therein and the number of that month in the year is visible through the slot 8. The plate 17 is then moved laterally by means of the knob 15 until number 1 is located under the proper week day corresponding with the month visible through the slot 8. This calendar may be reset each month continuously. It is thus evident that the calendar may be set to show any desired month whatever and may be used continuously for any month in any ear, that is, is operative as a perpetual ca endar and is therefore adapted to replace the usual desk and wall calendars which are useful for only one ear.

While I have illustrated and described the preferred form of construction for car rying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I therefore, do not wish to be limited to the precise details of the construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A calendar for disclosing any month comprising a holder provided with two rectangular openings in the face thereof, a strip on the face of said holder bearing the days of the week thereon, a sheet vertically slidable in said holder containing and disclosing a month with the respective number of days in said month and the number of said month in the year through the upper one of said openings, a sheet laterally slidable in the front of said vertically slidable sheet in said holder disclosing the days of the month through the lower one of said openings, and means extending from the backs of said sheets through the back of said calendar for arranging said sheets to disclose any calendar month.

2. A calendar for disclosing any month comprising a holder provided with a rectangular opening and a slotted opening in the face thereof and with a vertical slot and a lateral slot in the back thereof, a strip on the face of said holder between said openings bearing the days of the week thereon, a sheet back of said rectangular opening 5 containing the days of the month thereon, a stem 0n the back of said sheet extending through said lateral slot for moving said day sheet laterally, a sheet mounted back of said day sheet and said slotted opening con- 10 taining the months and the number of each month in the year thereon, and a stem on the back of said month sheet extending through said vertical slot for sliding said month sheet laterally.

In testimony whereof I have signed my 11. name to this speeifieation in the PIGSQIN'O of two subscribing Witnesses.

HAROLD O. WINDAHL.

Witnesses JOSHUA R. H. PoT'rs, CLARENCE E. Tnnnnny. 

